Reminders of the oyster's pre-eminence in this slice of northwestern Florida are everywhere, from the shells that line the edges of downtown buildings to the paintings of oysters that dot the walls of Apalachicola's art and history museum.

It's the oysters themselves that are harder to find these days, and Florida is hoping the Supreme Court can help fix that. The high court hears arguments Monday in the long-running dispute between Florida and neighboring Georgia over the flow of water in the Apalachicola River, which runs from the state line to Apalachicola Bay and the nearby Gulf of Mexico.

Florida sued Georgia in the Supreme Court in 2013, blaming farmers and booming metro Atlanta for low river flows that harmed the environment and fisheries dependent on fresh water entering the area. Florida portrays the case as its last chance to "stem Georgia's inequitable consumption" of water from the Chattahoochee and Flint rivers in Georgia, leaving too little by the time the rivers come together and pass into Florida.

"It is effectively strangling the Apalachicola Region and killing or threatening its animal and plant life," Florida said in its Supreme Court brief. Although the justices usually hear appeals, lawsuits between states start in the Supreme Court.

Georgia said Florida has failed to show that it would benefit from any cuts imposed on Georgia, pointing to the conclusion of a court-appointed special master who recommended that the justices side with Georgia. Georgia also said Florida is asking for unreasonable reductions that would "threaten the water supply of 5 million people in metropolitan Atlanta and risk crippling a multibillion-dollar agricultural sector in southwest Georgia."

Complicating the issue is the absence from the lawsuit of the U.S. Army Corps of Engineers, which manages dams on the Chattahoochee River.